question #3 Sahih al-Bukhari 4057, Book 64, Hadith 103 : What can be inferred about the relationship between the Prophet Muhammad (ﷺ) and his companions from this expression of sacrifice?

Sa`d bin Abi Waqqas said, “Allah’s Messenger (ﷺ) mentioned both his father and mother for me on the day
of the battle of Uhud.” He meant when the Prophet (ﷺ) said (to Sa`d) while the latter was fighting. “Let
my father and mother be sacrificed for you!”